You probably already have all the stuff you need to make this nifty paper cannon that fires at a surprisingly high muzzle velocity.
What you'll need:
• Glue gun
• Rubber bands
• Prescription bottle lids
• A shish kebab skewer or some other thin rod
And yes, a cannon typically uses an explosive, but this works more like an airsoft gun. It can shoot peas, pellets, or even tiny darts and harpoons with the power to penetrate styrofoam and even cork! Just don't shoot your eye out, kid!